MHD fluctuation level and transport in reversed field pinch.
نویسندگان
چکیده
منابع مشابه
Nonambipolar magnetic-fluctuation-induced particle transport and plasma flow in the MST reversed-field pinch.
First direct measurements of nonambipolar magnetic fluctuation-induced charge transport in the interior of a high-temperature plasma are reported. Global resistive tearing modes drive the charge transport which is measured in the vicinity of the resonant surface for the dominant core resonant mode. Finite charge transport has two important consequences. First, it generates a potential well alon...
متن کاملCoherent structures and anomalous transport in reversed field pinch plasmas
The results leading to the identification of coherent structures emerging from the background turbulence in the edge region of the reversed field pinch experiments EXTRAP-T2R and RFX are reviewed. These structures have traits of vortices in velocity field and blobs in density, and the reconstruction of their spatial structure and of their time evolution is discussed focusing on the analysis too...
متن کاملNeoclassical transport in the helical reversed-field pinch.
Test particle evaluation of the diffusion coefficient in a fusion plasma in the reversed-field pinch (RFP) configuration shows distinct similarities with stellarators when the plasma spontaneously evolves towards a helical shape. The almost total absence of superbanana particles at the levels of helical deformation seen in experiment (Bh/B=10%) causes transport to be proportional to collision f...
متن کاملNew Observations Concerning the Origin and Consequences of MHD Activity in the MST Reversed Field Pinch
Reversed Field Pinch (RFP) plasmas exhibit a broad spectrum of MHD activity. The instability underlying much of this activity in the standard RFP discharge has been identified as resistive tearing and is well modelled by nonlinear, resistive MHD. In recent years two additional types of discharge have been produced: those with reduced tearing activity leading to improved confinement and those wi...
متن کاملMode locking in reversed-field pinch experiments.
The MHD mode trajectory in the Madison Symmetric Torus reversed-field pinch has been found to obey the sine-Gordon equation. Corresponding to experiment, a perturbation analysis predicts the locations of mode locking to be at the vacuum chamber poloidal and/or toroidal gaps. The mode's energy dissipates when it locks, as shown by a decaying spiral phase-plane trajectory. Unlocked modes travel a...
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ژورنال
عنوان ژورنال: Kakuyūgō kenkyū
سال: 1989
ISSN: 0451-2375,1884-9571
DOI: 10.1585/jspf1958.61.164